Having objects placed in our mouth and not being able to close our mouth to protect oneself also goes against survival response.

Lying down places us in a very vulnerable position. This vulnerable position is called the supine position. It is difficult to defend oneself from a supine position.
And to add to the mix…
Many people who experienced impact trauma or relational trauma may have boundary ruptures.
A boundary rupture is a disruption of the neuroception which makes a space in that area being read as unsafe by the nervous system.
(Consider revise the wording). And often, the OHP has to sit right in the boundary rupture area in order to do their work. It makes it even more difficult for the patient to be regulated.
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